Mirroring + Remoting
Oct 6, 2006
Hi,
I have a 3-tier app that is currently running on a simple single server setup. However, I have to adapt it to run on the following setup:
1) Client .NET app on client systems with remoting connection to...
2) Host .NET app with a DAL connecting to ...
3) SQL Server 2005 mirrored
Using mirroring, if the principle SQL server goes down it switches automatically to the mirror server.
My question relates to my connections. What do I need to do to make sure the Client and Host apps follow SQL?
There are two setups I have in mind:
1) Host app + SQL on same box
2) Host app on its own server + SQL on its server (+mirror)
With these scenarios:
Setup 1 - SQL fails but server continues - Host app has to connect to mirror - clients continue to connect to Host on principle server.
Setup 1 - Whole server fails - Host on mirror server connects to mirror SQL and clints now have to locate Host on mirror.
Setup 2 - SQL's server fails so mirror switches in. Only Host app has to re-direct. Clients connect to same Host app.
This is new to me, so if anyone can advise, or direct me to the right info.
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Jun 2, 2005
who else can help me? My sql needs database remoting copy.
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Mar 15, 2007
Hi!I have installed Sql Server 2005 Express on my machine. I want to access this server from another machine in LAN.Also installed Sql Server 2005 on another machine. Allow Remote Connections is selected with Sql Server Surface Area Configuration.Please suggest the correct solution. (in detail) Thanks in advancemilind
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May 22, 2006
Hello,
I don't have a specific problem, I'm looking about resources because this is the tipical case when something is working but I don't know why ..
On particularly I have to load and run a dtsx package from a window application and the package is located on the server.
I decided to use .NET Remoting.
I developed my "Remotable Object" which contains:
package = Microsoft.SqlServer.Dts.Runtime.Application.LoadFromDtsServer()
package.Execute()
etc....etc...
The window application calls the Remotable object, call the specific method and the package is loaded and run successfully.
When I studied the .NET Remoting there is also Server that expose the Remotable Object.
In this case the Server is SSIS Service but I would like to know witch port is used, which method( singlecall or singleton ) is used and so on!
where I can find this info?Someone knows some resource to advice?? or I'm working with SSIS not on a remote way?
Thankx
Marina B.
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Jan 29, 2004
i am using sqlserver 2000,if so how,thanks.
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Nov 1, 2007
Hi,
I'd recently posted a question about using SQL CE as a database server for a multi-user desktop app. I did some development and tested it, and it seemed to work fine. What I did was:
1. create a remoteable object that used SqlCe classes to perform read and write operations to an encrypted CE database.
public class RemData : MarshalByRefObject
{
public DataSet GetData()
{
//Read data
}
public int AddData(DataSet data)
{
//Write data
}
}
2. hosted this object in a Remoting Server
TcpServerChannel channel = new TcpServerChannel(props, bp);
// Register the channel with the runtime remoting services
ChannelServices.RegisterChannel(channel, false);
RemotingConfiguration.RegisterWellKnownServiceType(
typeof(RemData ), // The type to register
"RM_RemData", // The objectURI
WellKnownObjectMode.SingleCall
);
So, basically the CE DB is running in-proc with this Remoting Server. This is hosted on a regular P2 1GB box.
3. created client WinForms app to connect to this object through remoting with url tcp://myserverip/RM_RemData and distributed this client EXE to various machines within the intranet to execute the GetData and AddData methods
This seems to work perfectly fine and super fast, and i was also concurrently executing the above methods in loops of 100.
So what I don't understand is why most of the posts I read about multi-user scenario here and on the web are always discouraging people to only use CE for single-user desktop? As long as I use the SQL CE ONLY as a Data Store and all logic into my data layer such as the Remotabe Objects, will this be a feasible option for around 10-20 Users since CE allows 256 Connections anyway?
My other questions are with regards to programmatically Import/Export to and from CSV and Excel..is this supported or anything planned?
Would appreciate a detailed response..my product hangs in balance as i need some closure on this
Thanks,
CP
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May 3, 2007
How can I access data to SQL server 2005 using Windows form application,ADO.net and .Net remoting?
Can anybody help me? please...
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Sep 12, 2007
When running an integration services package from a windows service I get the "Object ... has been disconnected or does not exist at the server." exception after aproximately six minutes of execution.
This is *not* my windows service failing. I can loop indefinately while tracing to a log file within the service and it will run forever. While calling the mypackage.execute(...) method however, after six minutes (give or take) the exception is thrown...
my code looks something like this:
<code>
dim foo as Microsoft.SqlServer.Dts.Runtime.Application
mypackage = foo..LoadPackage(strimportPkgFilename, pkgevents)
results = myPackage.Execute(Nothing, Nothing, pkgevents, Nothing, Nothing)
</code>
<error>
A first chance exception of type 'System.Runtime.Remoting.RemotingException' occurred in mscorlib.dll
Exception in: frmMyForm.DoImports
Message: Object '/b76f98a0_5bd9_49d8_a524_eeb49d55b303/bqbhkjnaofq_ifr_cwz+srid_1.rem' has been disconnected or does not exist at the server.
</error>
oddly, this same code works perfectly if I run it within a windows form application no matter how long it takes.
It also runs fine if the package can complete in under six minutes.
Any suggestions?
Mark
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May 3, 2008
Server A = primary SQL DBs (mirroring origination)
Server B = failover SQL DBs (mirroring destination)
For database mirroring a witness is required.
Can the witness live in another instance of SQL on server B?
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Oct 30, 2007
Hi guys,
I've been developing desktop client-server and web apps and have used Access and SQL Server Standard most of the time.
I'm looking into using SQL CE, and had a few questions that I can't seem to get a clear picture on:
- The documentation for CE says that it supports 256 simultaneous connections and offers the Isolation levels, Transactions, Locking, etc with a 4GB DB. But most people say that CE is strictly a single-user DB and should not be used as a DB Server.
Could CE be extended for use as a multi-user DB Server by creating a custom server such as a .NET Remoting Server hosted through a Windows Service (or any other custom host) on a machine whereby the CE DB would run in-process with this server on the machine which would then be accessed by multiple users from multiple machines??
Clients PCs -> Server PC hosting Remoting Service -> ADO.NET -> SQL CE
- and further more can we use Enterprise Services (Serviced Components) to connect to SQL CE and further extend this model to offer a pure high-quality DB Server?
Clients PCs -> Server PC hosting Remoting Service -> Enterprise Services -> ADO.NET -> SQL CE
Seems quite doable to me, but I may be wrong..please let me know either ways
Thanks,
CP
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Oct 12, 2015
Using SQL Server 2008, we would like propose mirroring between two servers of a critical database. Since we initiate, may require to clarify on its purpose and also required changes from application end.Any changes required from OS Level? (I believe both servers IP or Host name should be added in host entries. Mirroring ports should be allowed/open including Principal and mirror server IP Addresses): Windows Team.Any changes required from Application? (Instance name, authentication: user name and its password should be added in web config files): Application Team.Any changes required from Network Team?Also for mirroring both the principal and mirror servers should be with same version, does it only mean SQL Server 2008 versions are enough or does it also mean to say build numbers 10.00.4000 should also be same.URL....
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Sep 15, 2015
I need to set up asyncronous data replication across two clustered instances of SQL 2012 across 2 Datacenters. Both the datacenters have a common domain however the vlans are different. There are only 3 small databases on the primary instance.
any issue in setting up mirroring in this case as vlans are different.
Operating system is Windows 2012.
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Mar 7, 2000
Hi All
By mirroring I mean device mirror, since I do not think that there is a database mirror
We only have disk mirror. I also know that SQLServer 7.0 does not provide Mirror, unmirror or remirror. and for this we have to refer to Windows NT disk mirroring.
I need mirroring in both versions SQL Server 6.5 and 7.0
I want to have mirror on another server. I need this for tonight.
Sincerely.
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Apr 1, 2008
I hereby let u know the steps that i undertook for performing mirroring
1. Created a database in Principal server named Mirror1 and one table named tblMirror1.( no values inside the table)
2. Repeated the same in Mirror in Witness
3. Selected the Principal server's database -->right click-->tasks-->mirror
4. from the left hand panel selected Options -->recovery model-->full
5. selected Mirroring from left hand panel-->configure secuirty-->entered mirror and witness name--Success
6. When I click on start mirroring I have an error stating
" Alter failed for database mirror1"
"Database mirroring cannot be enabled because Mirror1 database may have bulk logged changes that have not been backed up etc...."
7. followed this one
BACKUP database mirror1 TO DISK='C:Program FilesMicrosoft SQL ServerMSSQL.1MSSQLBackupmirror1_FULL.BAK'
got the answer as
Processed 160 pages for database 'mirror1', file 'Mirror1' on file 2.
Processed 1 pages for database 'mirror1', file 'Mirror1_log' on file 2.
BACKUP DATABASE successfully processed 161 pages in 0.318 seconds (4.147 MB/sec).
According to sources
Run a restore of this backup on your mirror.
This can be done through the GUI or using a T-SQL command.
The database restore must use the NO RECOVERY option, so the database stays in a loading state.
Also the database name on the mirror must be the exact same name as the principal
RESTORE TestMirror FROM DISK='C:Backup TestMirror_FULL.BAK' WITH NORECOVERY
Hence did the below
RESTORE database mirror1 FROM DISK='C:Program FilesMicrosoft SQL ServerMSSQL.1MSSQLBackupmirror1_FULL.BAK' WITH NORECOVERY
ERROR
Msg 3201, Level 16, State 2, Line 1
Cannot open backup device 'C:Program FilesMicrosoft SQL ServerMSSQL.1MSSQLBackupmirror1_FULL.BAK'. Operating system error 2(The system cannot find the file specified.).
Msg 3013, Level 16, State 1, Line 1
RESTORE DATABASE is terminating abnormally.
HENCE MODIFIED AS
use master
go
RESTORE database mirror1 FROM DISK='C:Program FilesMicrosoft SQL ServerMSSQL.1MSSQLBackupmirror1_FULL.BAK' WITH NORECOVERY
Msg 3201, Level 16, State 2, Line 1
Cannot open backup device 'C:Program FilesMicrosoft SQL ServerMSSQL.1MSSQLBackupmirror1_FULL.BAK'. Operating system error 2(The system cannot find the file specified.).
Msg 3013, Level 16, State 1, Line 1
RESTORE DATABASE is terminating abnormally.
========
Kindly let me know please where am i going wrong
Regards
cmrhema
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Mar 13, 2007
hello
if i run dbcc dbreindex on a database thats the principal in a mirrored pair, will the mirrored database indexes also be rebuilt?
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Mar 27, 2007
i am for the first time creating the database mirroring.I am moving the all the usr databases and everything from test server to a new server called test1.And from that new server i am restoring on the another new server called test2 for database mirroring.But in the test server , the transaction logs are backup for every 15 minutes.So in this case is there a need to move all the logs to test1 and then to test2 for mirroring?? or there is no need to move transaction logs to the new servers at all??
my secnario
------------
server1 server2 server3
-------- ------- --------
test test1 (moving everything from test) test2(mirror for test1 )
all the transaction logs are backup in test for every 15 minutes. so in this case , do i need to move the transcation logs from test to test1 and test2
or there is not need to move at all??
thanks,
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Nov 7, 2007
Can anyone please tell me what mirroring is??
Thanks in ADvance
RKNAIR
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Jan 30, 2008
I have sql server 2005 on my vista laptop.
When i set up database mirroring, do i have to set up Principle,
mirror and witness on seperate servers as well as seperate instances.
Or can i install 3 seperate instances on the same laptop im using and still use mirroring? I have tried to start mirroring with all three instances on my laptop but i receive an error.
Regards
Rob
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Mar 26, 2008
Hi All,
I am trying to set up database mirroring and in the initial phase of database restoring im getting some problem.
the scenario is .
1- I create a TestMirror on server1(which will be principal server) and backup full and transaction logs.
2- create TestMirror in server 2( Which is going to be used as mirror) .
3- restore the full backup of "TestMirror" from Principle Sever with NORECOVERY option.
this step results in a message box showing that the restore was successfull...
but the database explorer( management studio) shows the TestMirror in (restoring ...) state. and no more operations can be performed with this Database. ( because the database is in restoring mode).. please help what this issue is?
Thanks In Advance for any suggestions
-- Krishna
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May 6, 2007
hello
i used following query to create endpoint
CREATE ENDPOINT Endpoint_Mirroring
STATE = STARTED
AS TCP (
LISTENER_PORT=5024
, LISTENER_IP = ALL
)
FOR DATABASE_MIRRORING (
AUTHENTICATION = CERTIFICATE HOST_A_cert
, ENCRYPTION = REQUIRED ALGORITHM RC4
, ROLE = ALL
);
GO
i got the following error msg:
Msg 1498, Level 16, State 2, Line 11
Database mirroring is disabled by default. Database mirroring is currently provided for evaluation purposes only and is not to be used in production environments. To enable database mirroring for evaluation purposes, use trace flag 1400 during startup. For more information about trace flags and startup options, see SQL Server Books Online.
any help plzz
thanks in advance
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Aug 22, 2007
Hello,
I have Microsoft SQL SERVER 2005 installed in my system.
To try out mirroring, I rightclicked on the database went to the tasks, but i found that in Status its written
"This database has not been configured for mirroring"
What shall I do now?
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Oct 22, 2007
Hi,
I am new to DB mirroring and witness. For the purpose of learning, any one can suggest me like is there any posibility to do the DB mirroring and witness on 2 or 3 VHD Files. Basically, these VHD's are downloaded from microsoft website.
VHD's have W2K3 and SQL2K5 EE .
Please suggest me in this.
Regards,
Mohanraj Jayaraman
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Nov 10, 2006
Hello Guys,
Can any one help I want SQL to email me when a database fails over I can find alerts for loads of thing to do with Mirroring but not to notify me when a database failover.
Thanks matt
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Nov 23, 2006
How sql server will mirror big transaction ?
Example
inserting 10000000 rows in 1 transaction (columns big ,text data ...)
will it transfer data in multiple packets (size, location of temp file) to mirror ?
will it transfer data in 1 packet (size , location of temp file ) to mirror ?
Can you control transfer (size , location of temp file) ?
Thanks
Alex
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Sep 28, 1998
Do you know if the following excerpt from technet is still true? I want to mirror a device over the net to another server. Has anyone tried this with sql server 6.5 or is it still not a feature?
----------------------
PSS ID Number: Q115043
Article last modified on 04-29-1997
4.2 | 4.2
OS/2 WINDOWS
================================================== ====================
----------------------------------------------------------------------
The information in this article applies to:
- Microsoft SQL Server version 4.2 for OS/2
- Microsoft SQL Server version 4.2
----------------------------------------------------------------------
The use of database devices accessed over the network is not a supported
configuration for either the OS/2 or Windows NT versions of Microsoft SQL
Server. All database devices, including mirrors, should be configured to
use local drives. Database dump devices are an exception to this
restriction.
----------------
Thanks.
Gail Wade
Raymond James and Associates
Clearwater, FL
gwade@is.rjf.com
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Aug 10, 2006
I am testing out Synchronous Mirroring and have a question about failover. It seems the only way I can failover to the Mirror box is to log onto the Principal box and hit the Failover button? Is the whole point of mirroring to be able to handle the Principal not being available? Is there another way?
TIA, ChrisR
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Oct 12, 2007
Hi All,
Does anybody know the OS requirements for Database Mirroring? I checked BOL and Google but couldn't find any info on that.
Thanks.
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Feb 27, 2008
Hi All,
I have read on the web that high protection mode not recommended, except in the event of replacing the existing witness server. But I can't find the reason why anywhere. Can anybody explain? Thanks.
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Mar 12, 2008
Hi All,
Couple of questions about database mirroing.
1. Once the mirroring is setup is it possible to switch between high-protection and high-performance modes? If it is will I have to stop the mirroring, switch the modes and then restart it again?
2. Let's say the principal server went down and I manually failed over to the mirror server. Mirror server runs as a new principal server for a couple of days and then I bring the original principal server back up. What needs to be done in order to bring transactions on the principal server up to date?
Thanks.
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Apr 1, 2008
Hi,
I have place an question, but in some other place in the same forum.
My apologies for that
I wanted to implement mirroring
I hereby let u know the steps
1. Created a database in Principal server named Mirror1 and one table named tblMirror1.( no values inside the table)
2. Repeated the same in Mirror in Witness
3. Selected the Principal server's database -->right click-->tasks-->mirror
4. from the left hand panel selected Options -->recovery model-->full
5. selected Mirroring from left hand panel-->configure secuirty-->entered mirror and witness name--Success
6. When I click on start mirroring I have an error stating
" Alter failed for database mirror1"
"Database mirroring cannot be enabled because Mirror1 database may have bulk logged changes that have not been backed up etc...."
7. followed this one
BACKUP database mirror1 TO DISK='C:Program FilesMicrosoft SQL ServerMSSQL.1MSSQLBackupmirror1_FULL.BAK'
got the answer as
Processed 160 pages for database 'mirror1', file 'Mirror1' on file 2.
Processed 1 pages for database 'mirror1', file 'Mirror1_log' on file 2.
BACKUP DATABASE successfully processed 161 pages in 0.318 seconds (4.147 MB/sec).
According to sources
Run a restore of this backup on your mirror.
This can be done through the GUI or using a T-SQL command.
The database restore must use the NO RECOVERY option, so the database stays in a loading state.
Also the database name on the mirror must be the exact same name as the principal
RESTORE TestMirror FROM DISK='C:Backup TestMirror_FULL.BAK' WITH NORECOVERY
Hence did the below
RESTORE database mirror1 FROM DISK='C:Program FilesMicrosoft SQL ServerMSSQL.1MSSQLBackupmirror1_FULL.BAK' WITH NORECOVERY
ERROR
Msg 3201, Level 16, State 2, Line 1
Cannot open backup device 'C:Program FilesMicrosoft SQL ServerMSSQL.1MSSQLBackupmirror1_FULL.BAK'. Operating system error 2(The system cannot find the file specified.).
Msg 3013, Level 16, State 1, Line 1
RESTORE DATABASE is terminating abnormally.
HENCE MODIFIED AS
use master
go
RESTORE database mirror1 FROM DISK='C:Program FilesMicrosoft SQL ServerMSSQL.1MSSQLBackupmirror1_FULL.BAK' WITH NORECOVERY
Msg 3201, Level 16, State 2, Line 1
Cannot open backup device 'C:Program FilesMicrosoft SQL ServerMSSQL.1MSSQLBackupmirror1_FULL.BAK'. Operating system error 2(The system cannot find the file specified.).
Msg 3013, Level 16, State 1, Line 1
RESTORE DATABASE is terminating abnormally.
Please let me know what shuld i modify
regards
cmrhema
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May 16, 2008
I think I've read some conflicting advice in BOL. Maybe someone can clarify it for me.
Under "Database Mirroring and Database Snapshots" it says:
"You can take advantage of a mirror database that you are maintaining for availability purposes to offload reporting. To use a mirror database for reporting, you can create a database snapshots on the mirror database and direct client connection requests to the most recent snapshot"
To my mind, to enjoy a noteworthy performance gain, that mirror database would need to be on another server.
But then you read under "Database Snapshots":
"Multiple snapshots can exist on a source database and always reside on the same server instance as the database."
So how do you get the snapshot to the mirror?
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Jun 5, 2008
I have a quick question regarding mirroring failover. If you have mirroring setup with a witness and the principal server goes down, once the principal is back up as the mirror will it automatically synchronize with the new Principal?
The main thing that I wasn't sure of is that if it took a fair amount of time to bring the original principal back up, the new principal will be in production so will all the new transactions be sent to the mirror once it is available?
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Mar 15, 2007
for a database mirroring , which stretergy is good.
Creating with witness server or without it.?
I am firsttime doing this , so i am posting it to the forum..
and also if we are creating the database mirroring with witness server for automatic failover , will the witness server need the same amount of harddisk space like the pricipal or mirror server.??
thanks
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